| Project/Area Number |
24560462
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Communication/Network engineering
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
MIZUNAMI Toru 九州工業大学, 工学(系)研究科(研究院), 教授 (00174029)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 長周期グレーティング / 光ファイバセンサ / モード分割多重光通信 / 水銀ランプ / 光ファイバデバイス / 低圧水銀ランプ / 光ファイバ / 回折格子 |
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| Outline of Final Research Achievements |
Fiber-optic grating devices have been used as filters for optical communication, mode converters, or fiber-optic sensors. Here, fabrication of long-period fiber-gratings without using an expensive and bulky excimer laser was studied. A low-pressure mercury lamp at 254 nm was used as a writing source. The exposure time was shortened to a one-third of the initial value by improving hydrogen loading. The fabricated long-period gratings were used as temperature and strain sensors. Also, when higher-order propagating modes were excited by off-axis coupling, it was confirmed that the transmission spectrum of the long-period grating was different from that of the fundamental-mode excitation. A vertical-cavity surface-emitting laser was found to be effective as a light source for sensing.
As for another fiber-grating device, a thermally poled fiber for the second-harmonic generation was studied, and quasi phase-matching was performed with periodic exposure with a low-pressure mercury lamp.
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